I had the same problem and currently (as of Dozer 5.5.x) there's no simple way, but there is complex one.
Note, that it relies on having no security manager enabled in JVM, or else you will need to add few permissions in the security rules. That's because this solution uses reflection to access private fields of Dozer classes.
You need to extend 2 classes: DozerBeanMapper and MappingProcessor. You will also need enum for direction and interface to get direction from above classes.
The enum:
public enum Direction {
TO,
FROM;
}
The interface:
public interface DirectionAware {
Direction getDirection();
}
The class extending DozerBeanMapper:
public class DirectionAwareDozerBeanMapper extends DozerBeanMapper implements DirectionAware {
private Direction direction;
public DirectionAwareDozerBeanMapper(Direction direction) {
super();
this.direction = direction;
}
public DirectionAwareDozerBeanMapper(Direction direction, List<String> mappingFiles) {
super(mappingFiles);
this.direction = direction;
}
@Override
protected Mapper getMappingProcessor() {
try {
Method m = DozerBeanMapper.class.getDeclaredMethod("initMappings");
m.setAccessible(true);
m.invoke(this);
} catch (NoSuchMethodException|SecurityException|IllegalAccessException|IllegalArgumentException|InvocationTargetException e) {
// Handle the exception as you want
}
ClassMappings arg1 = (ClassMappings)getField("customMappings");
Configuration arg2 = (Configuration)getFieldValue("globalConfiguration");
CacheManager arg3 = (CacheManager)getField("cacheManager");
StatisticsManager arg4 = (StatisticsManager)getField("statsMgr");
List<CustomConverter> arg5 = (List<CustomConverter>)getField("customConverters");
DozerEventManager arg6 = (DozerEventManager)getField("eventManager");
Map<String, CustomConverter> arg7 = (Map<String, CustomConverter>)getField("customConvertersWithId");
Mapper mapper = new DirectionAwareMappingProcessor(arg1, arg2, arg3, arg4, arg5,
arg6, getCustomFieldMapper(), arg7, direction);
return mapper;
}
private Object getField(String fieldName) {
try {
Field field = DozerBeanMapper.class.getDeclaredField(fieldName);
field.setAccessible(true);
return field.get(this);
} catch (NoSuchFieldException|SecurityException|IllegalArgumentException|IllegalAccessException e) {
// Handle the exception as you want
}
return null;
}
public Direction getDirection() {
return direction;
}
}
The class extending MappingProcessor:
public class DirectionAwareMappingProcessor extends MappingProcessor implements DirectionAware {
private Direction direction;
protected DirectionAwareMappingProcessor(ClassMappings arg1, Configuration arg2, CacheManager arg3, StatisticsManager arg4, List<CustomConverter> arg5, DozerEventManager arg6, CustomFieldMapper arg7, Map<String, CustomConverter> arg8, Direction direction) {
super(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
this.direction = direction;
}
public Direction getDirection() {
return direction;
}
}
Now, the usage.
1) Everytime you want to map the same primitive type (for example String-String), use DozerConverter with that type for both arguments as a custom converter in your dozer mappings file. The implementation of such converter should extend: DozerConverter<String,String> and implement MapperAware interface. This is important that you have MapperAware available, becuase having the mapper you will be able to cast it to DirectionAware and then get the direction.
For example:
public class MyMapper extends DozerConverter<String, String> implements MapperAware {
private DirectionAware dirAware;
public MyMapper(Class<String> cls) {
super(cls, cls);
}
@Override
public Object convert(Object existingDestinationFieldValue, Object sourceFieldValue, Class<String> destinationClass, Class<String> sourceClass) {
if (dirAware.getDirection() == Direction.FROM) {
// TODO convert sourceFieldValue for "FROM" direction and return it
} else {
// TODO convert sourceFieldValue for "TO" direction and return it
}
}
@Override
public void setMapper(Mapper mapper) {
dirAware = (DirectionAware)mapper;
}
}
2) You need to create 2 global Dozer mapper objects, one per mapping direction. They should be configured with the same mapping files, but with different direction argument. For example:
DirectionAwareDozerBeanMapper mapperFrom = DirectionAwareDozerBeanMapper(mappingFiles, Direction.FROM);
DirectionAwareDozerBeanMapper mapperTo = DirectionAwareDozerBeanMapper(mappingFiles, Direction.TO);
Of course you will need use proper mapper (from/to) to provide information to custom mappers on which direction you're mapping.
